Electrical heating element.



PATENTED MAY 12, 1908.

F. KUHN. ELECTRICAL HEATING ELEMENT.

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UNITED STATES ra rnnr OFFICE.

FRANK KUHN, OF DETROIT, MICHIGAN, A$IGNOR TO- AMERICAN ELECTRICAL HEATER COMPANY, 01 DETROIT, MICHU LN, A CORPORATION OF MICHIGAN.

ELECTRICAL ILEATING ELEMENT.

Application filed October 15,

Be it knownthat I, FRANK lions, a eitigien of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful lmprovtunents in Electrical l'lez'tting Elements, of which the following a specification, reference being h d therein to the accompai'iying drawings.

The invention relates to electrical heating elements, being more particularly designed for use in electrically heated sad irons, and the inventionconsists in certain features of construction as hereinafter set forth.

In the. drawingsl igure 1 is a plan view of the element; Fig. 2 is a cross section througl t a sad iron provided with the element; Fig. 3 is a longitudinal section through a portion of Fig. 2; and Fig. l is a perspective view of the members of the resistance clement. Fig. 5 is a section through two adjacentbridge connec tions showing the relation of the resistance elements thereto.

In the construction of elect'ri .al heaters, it is inmortant-to provide means for rapidly connnunicating the heat from the resistance element to the surface to be heated, and it is equally important to' provide a uniform distribution of heat over the surface. it has also been found desirable to have the resistance element, detachable from the body of the heater so as to permit of quickly exchanging elements when necessary.

With the present invention, the heating element is arranged to conmutnicate the-heat ment being detachable from said surface.

As shown, A is the body portion of the heater, such a sad iron, and B the bottom thereof, w tich forms the surface to be heated. The heating elcmcntC is arranged to be placed in a recess 1) in the body A, and is of the following construction1 1*] are the resistance elements, which are composed of alternately arranged laminated ('(llltllltllll'l' and insulators such, for instance, as sheets of metallic foil and mica. A. plurality of these. resistance elements are arral'tged parallel to each ot'hcr and are separated by intern'iedi ate heat distributing bars 1, the whole series being clamped into tirm mechanical contact by bolts or riveted rods G passing thrt'iugh transverse apertures in theserics. The heat distributing bars F are insulated from the Specification of Letters Patent.

Patented May 12, 1908.

1'90'1. Serial No. 397,531.

resistance elements, and the several elements of the series are coupled to each other by bridge connections H. These are preferably in the form of U-shaped metal strips, the

ends of which are in contact with the terminals of the metallic foil of the elements C, and which extend across the ends of the heat distributors F, out of contact therewith. The bars F are of greater width than the elements C and the bridges H, and have their lower edges in metallic contact with the bottom B of the body.

With the construction as described, the heat generated by the passage of an electric current through the series of resistances will be co-rmnunicated by conduction, first to the intermediate heat distributing bars'F, and then also by conduction from the latter to the bottom B. This will effect a much more rapid distribution of heat than would be possible by radiation from the resistance element. and by reason of the fact that the intermediate bars F are relatively large in mass tu'iiformity in the distribution of the heat is obtained.

The terminal connections for the heating element are formed by members I id 1 secured to the cover J for the body of the sad iron, these members having resilient end portions which bear against terminal plates K and K on the upper face of the element 0. In addition to forming the electrical connection to the element, these members I and I press the bars F downward into firm metallic contact with the bottom D of the body, thereby facilitating the rapid conduction of the heat.

Vt hat I claim as my invention is:

l In-an electrical heater, the combination with the body to be heated, of a heating ele ment detachable therefrom and comprising a series of parallelly arranged resistance elements and intermediate insulated heat c0nducting bars, said resistance element an'd bars being clamped in heat conducting contact and the edges of said bars being held in heat conducting contact with said body.

2. in an electrical heater, a heating element comprising .a series of parallelly arranged resistance elements, alternate insulated heat conducting bars, and naked bridge strips electrically connecting the terminals of the adjacent resistance elements, being ispaced from contact with said intermediate )iLI'S.

3. In an electrical heater, a heating element comprising a series of parallelly arran ed laminated resistance elements, internie ate insulated heat conducting bars and U-shaped bridges electrically connecting said resistance elements at the ends of said lntermediate bars and spaced from contact vdth the latter.

4:. In an electrical heater, the combination with a recessed body, of a heatin element detachably engaging said body and comprising a series of parallelly arranged resistance elements, intermediate insulated heat distributing bars, and naked bridge connections between the resistance elementsspaced from v FRANK KUHN. Witnesses NELLIE KINSELLA, HARRY W. GALVIN. 

